A substance that cannot be broken down to other substances by chemical reactions

A substance consisting of two or more different elements in a fixed ratio has different characteristics than those of elements

THE BIG 4 that make up 96% of all living matter / backbones

Carbon, Hydrogen, Oxygen, Nitrogen

only required by organism in minute quantities calcium, phosphorus, potassium, magnesium, and sulfur

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bio 201

biology chapters 2-5

Question	Answer
ELEMENT	A substance that cannot be broken down to other substances by chemical reactions
COMPOUND	A substance consisting of two or more different elements in a fixed ratio has different characteristics than those of elements
_ of the _ elements are required for life.	25 , 92
THE BIG 4 that make up 96% of all living matter / backbones	Carbon, Hydrogen, Oxygen, Nitrogen
TRACE ELEMENTS	only required by organism in minute quantities calcium, phosphorus, potassium, magnesium, and sulfur
NO ELECTRICAL CHARGE - HAS NUCLEUS	Neutrons